Resolution Scaling.html

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta
      name="viewport"
      content="width=device-width, initial-scale=1, maximum-scale=1, minimum-scale=1, user-scalable=no"
    />
    <meta
      name="description"
      content="Set a custom resolution scale and/or toggle the browser's recommended resolution."
    />
    <meta name="cesium-sandcastle-labels" content="Showcases" />
    <title>Cesium Demo</title>
    <script type="text/javascript" src="../Sandcastle-header.js"></script>
    <script
      type="text/javascript"
      src="../../../Build/CesiumUnminified/Cesium.js"
      nomodule
    ></script>
    <script type="module" src="../load-cesium-es6.js"></script>
  </head>
  <body
    class="sandcastle-loading"
    data-sandcastle-bucket="bucket-requirejs.html"
  >
    <style>
      @import url(../templates/bucket.css);
    </style>
    <div id="cesiumContainer" class="fullSize"></div>
    <div id="loadingOverlay"><h1>Loading...</h1></div>
    <div id="toolbar">
      <table>
        <tbody>
          <tr>
            <td>Use Browser Recommended Resolution</td>
            <td>
              <input
                type="checkbox"
                data-bind="checked: useBrowserRecommendedResolution"
              />
            </td>
          </tr>
          <tr>
            <td>Resolution Scale</td>
            <td>
              <input
                type="range"
                min="0.1"
                max="2.0"
                step="0.1"
                data-bind="value: resolutionScale, valueUpdate: 'input'"
              />
              <input type="text" size="5" data-bind="value: resolutionScale" />
            </td>
          </tr>
        </tbody>
      </table>
    </div>
    <script id="cesium_sandcastle_script">
      function startup(Cesium) {
        "use strict";
        //Sandcastle_Begin
        // When browser recommended resolution is enabled, the viewer renders at
        // CSS pixel resolution (96 dpi). Otherwise, the viewer renders at the
        // screen's native resolution.
        //
        // Resolution scale applies an additional scaling factor to the
        // WebGL canvas.
        //
        // For example, if the cesium container div is 500x500 pixels,
        // window.devicePixelRatio is 2.0, and useBrowserRecommendedResolution
        // is false, the WebGL canvas will be 1000x1000 pixels. Then if
        // the resolutionScale is 0.25, the canvas will be scaled
        // down to 250x250 pixels.

        var viewer = new Cesium.Viewer("cesiumContainer");

        var viewModel = {
          useBrowserRecommendedResolution: false,
          resolutionScale: 0.25,
        };

        Cesium.knockout.track(viewModel);
        var toolbar = document.getElementById("toolbar");
        Cesium.knockout.applyBindings(viewModel, toolbar);
        for (var name in viewModel) {
          if (viewModel.hasOwnProperty(name)) {
            Cesium.knockout.getObservable(viewModel, name).subscribe(update);
          }
        }

        function update() {
          viewer.useBrowserRecommendedResolution =
            viewModel.useBrowserRecommendedResolution;

          var resolutionScale = Number(viewModel.resolutionScale);
          resolutionScale = !isNaN(resolutionScale) ? resolutionScale : 1.0;
          resolutionScale = Cesium.Math.clamp(resolutionScale, 0.1, 2.0);
          viewer.resolutionScale = resolutionScale;
        }
        update();
        //Sandcastle_End
        Sandcastle.finishedLoading();
      }
      if (typeof Cesium !== "undefined") {
        window.startupCalled = true;
        startup(Cesium);
      }
    </script>
  </body>
</html>